著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL American Society of Safety Engineers and American Standards Association and United States. Bureau of Labor Statistics,"Safety code for the construction, care and use of ladders : American Society of Safety Engineers, sponsor : tentative American standard approved July 25, 1923, by American Engineering Standards Committee",,U.S. G.P.O.,1923,Bulletin,,,,https://cir.nii.ac.jp/crid/1130000796650747904